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-rwxr-xr-xfs/ext4/format/block.c578
1 files changed, 578 insertions, 0 deletions
diff --git a/fs/ext4/format/block.c b/fs/ext4/format/block.c
new file mode 100755
index 0000000..0e53fd1
--- /dev/null
+++ b/fs/ext4/format/block.c
@@ -0,0 +1,578 @@
+/*
+ * block.c --- iterate over all blocks in an inode
+ *
+ * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include <common.h>
+//#include <ext_common.h>
+//#include <ext4fs.h>
+#include <malloc.h>
+#include <stddef.h>
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+struct block_context {
+ ext2_filsys fs;
+ int (*func)(ext2_filsys fs,
+ blk_t *blocknr,
+ e2_blkcnt_t bcount,
+ blk_t ref_blk,
+ int ref_offset,
+ void *priv_data);
+ e2_blkcnt_t bcount;
+ int bsize;
+ int flags;
+ errcode_t errcode;
+ char *ind_buf;
+ char *dind_buf;
+ char *tind_buf;
+ void *priv_data;
+};
+
+#define check_for_ro_violation_return(ctx, ret) \
+ do { \
+ if (((ctx)->flags & BLOCK_FLAG_READ_ONLY) && \
+ ((ret) & BLOCK_CHANGED)) { \
+ (ctx)->errcode = EXT2_ET_RO_BLOCK_ITERATE; \
+ ret |= BLOCK_ABORT | BLOCK_ERROR; \
+ return ret; \
+ } \
+ } while (0)
+
+#define check_for_ro_violation_goto(ctx, ret, label) \
+ do { \
+ if (((ctx)->flags & BLOCK_FLAG_READ_ONLY) && \
+ ((ret) & BLOCK_CHANGED)) { \
+ (ctx)->errcode = EXT2_ET_RO_BLOCK_ITERATE; \
+ ret |= BLOCK_ABORT | BLOCK_ERROR; \
+ goto label; \
+ } \
+ } while (0)
+
+static int block_iterate_ind(blk_t *ind_block, blk_t ref_block,
+ int ref_offset, struct block_context *ctx)
+{
+ int ret = 0, changed = 0;
+ int i, flags, limit, offset;
+ blk_t *block_nr;
+
+ limit = ctx->fs->blocksize >> 2;
+ if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY))
+ ret = (*ctx->func)(ctx->fs, ind_block,
+ BLOCK_COUNT_IND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ if (!*ind_block || (ret & BLOCK_ABORT)) {
+ ctx->bcount += limit;
+ return ret;
+ }
+ if (*ind_block >= ctx->fs->super->s_blocks_count ||
+ *ind_block < ctx->fs->super->s_first_data_block) {
+ ctx->errcode = EXT2_ET_BAD_IND_BLOCK;
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+ ctx->errcode = ext2fs_read_ind_block(ctx->fs, *ind_block,
+ ctx->ind_buf);
+ if (ctx->errcode) {
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+
+ block_nr = (blk_t *) ctx->ind_buf;
+ offset = 0;
+ if (ctx->flags & BLOCK_FLAG_APPEND) {
+ for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
+ flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
+ *ind_block, offset,
+ ctx->priv_data);
+ changed |= flags;
+ if (flags & BLOCK_ABORT) {
+ ret |= BLOCK_ABORT;
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ } else {
+ for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
+ if (*block_nr == 0)
+ goto skip_sparse;
+ flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
+ *ind_block, offset,
+ ctx->priv_data);
+ changed |= flags;
+ if (flags & BLOCK_ABORT) {
+ ret |= BLOCK_ABORT;
+ break;
+ }
+ skip_sparse:
+ offset += sizeof(blk_t);
+ }
+ }
+ check_for_ro_violation_return(ctx, changed);
+ if (changed & BLOCK_CHANGED) {
+ ctx->errcode = ext2fs_write_ind_block(ctx->fs, *ind_block,
+ ctx->ind_buf);
+ if (ctx->errcode)
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ }
+ if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
+ !(ret & BLOCK_ABORT))
+ ret |= (*ctx->func)(ctx->fs, ind_block,
+ BLOCK_COUNT_IND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ return ret;
+}
+
+static int block_iterate_dind(blk_t *dind_block, blk_t ref_block,
+ int ref_offset, struct block_context *ctx)
+{
+ int ret = 0, changed = 0;
+ int i, flags, limit, offset;
+ blk_t *block_nr;
+
+ limit = ctx->fs->blocksize >> 2;
+ if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
+ BLOCK_FLAG_DATA_ONLY)))
+ ret = (*ctx->func)(ctx->fs, dind_block,
+ BLOCK_COUNT_DIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ if (!*dind_block || (ret & BLOCK_ABORT)) {
+ ctx->bcount += limit*limit;
+ return ret;
+ }
+ if (*dind_block >= ctx->fs->super->s_blocks_count ||
+ *dind_block < ctx->fs->super->s_first_data_block) {
+ ctx->errcode = EXT2_ET_BAD_DIND_BLOCK;
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+ ctx->errcode = ext2fs_read_ind_block(ctx->fs, *dind_block,
+ ctx->dind_buf);
+ if (ctx->errcode) {
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+
+ block_nr = (blk_t *) ctx->dind_buf;
+ offset = 0;
+ if (ctx->flags & BLOCK_FLAG_APPEND) {
+ for (i = 0; i < limit; i++, block_nr++) {
+ flags = block_iterate_ind(block_nr,
+ *dind_block, offset,
+ ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ } else {
+ for (i = 0; i < limit; i++, block_nr++) {
+ if (*block_nr == 0) {
+ ctx->bcount += limit;
+ continue;
+ }
+ flags = block_iterate_ind(block_nr,
+ *dind_block, offset,
+ ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ }
+ check_for_ro_violation_return(ctx, changed);
+ if (changed & BLOCK_CHANGED) {
+ ctx->errcode = ext2fs_write_ind_block(ctx->fs, *dind_block,
+ ctx->dind_buf);
+ if (ctx->errcode)
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ }
+ if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
+ !(ret & BLOCK_ABORT))
+ ret |= (*ctx->func)(ctx->fs, dind_block,
+ BLOCK_COUNT_DIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ return ret;
+}
+
+static int block_iterate_tind(blk_t *tind_block, blk_t ref_block,
+ int ref_offset, struct block_context *ctx)
+{
+ int ret = 0, changed = 0;
+ int i, flags, limit, offset;
+ blk_t *block_nr;
+
+ limit = ctx->fs->blocksize >> 2;
+ if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
+ BLOCK_FLAG_DATA_ONLY)))
+ ret = (*ctx->func)(ctx->fs, tind_block,
+ BLOCK_COUNT_TIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ if (!*tind_block || (ret & BLOCK_ABORT)) {
+ ctx->bcount += limit*limit*limit;
+ return ret;
+ }
+ if (*tind_block >= ctx->fs->super->s_blocks_count ||
+ *tind_block < ctx->fs->super->s_first_data_block) {
+ ctx->errcode = EXT2_ET_BAD_TIND_BLOCK;
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+ ctx->errcode = ext2fs_read_ind_block(ctx->fs, *tind_block,
+ ctx->tind_buf);
+ if (ctx->errcode) {
+ ret |= BLOCK_ERROR;
+ return ret;
+ }
+
+ block_nr = (blk_t *) ctx->tind_buf;
+ offset = 0;
+ if (ctx->flags & BLOCK_FLAG_APPEND) {
+ for (i = 0; i < limit; i++, block_nr++) {
+ flags = block_iterate_dind(block_nr,
+ *tind_block,
+ offset, ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ } else {
+ for (i = 0; i < limit; i++, block_nr++) {
+ if (*block_nr == 0) {
+ ctx->bcount += limit*limit;
+ continue;
+ }
+ flags = block_iterate_dind(block_nr,
+ *tind_block,
+ offset, ctx);
+ changed |= flags;
+ if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
+ ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
+ break;
+ }
+ offset += sizeof(blk_t);
+ }
+ }
+ check_for_ro_violation_return(ctx, changed);
+ if (changed & BLOCK_CHANGED) {
+ ctx->errcode = ext2fs_write_ind_block(ctx->fs, *tind_block,
+ ctx->tind_buf);
+ if (ctx->errcode)
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ }
+ if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
+ !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
+ !(ret & BLOCK_ABORT))
+ ret |= (*ctx->func)(ctx->fs, tind_block,
+ BLOCK_COUNT_TIND, ref_block,
+ ref_offset, ctx->priv_data);
+ check_for_ro_violation_return(ctx, ret);
+ return ret;
+}
+
+
+/*
+ * Helper function for creating the journal using direct I/O routines
+ */
+struct mkjournal_struct {
+ int num_blocks;
+ int newblocks;
+ blk_t goal;
+ blk_t blk_to_zero;
+ int zero_count;
+ char *buf;
+ errcode_t err;
+};
+
+
+errcode_t ext2fs_block_iterate2(ext2_filsys fs,
+ ext2_ino_t ino,
+ int flags,
+ char *block_buf,
+ int (*func)(ext2_filsys fs,
+ blk_t *blocknr,
+ e2_blkcnt_t blockcnt,
+ blk_t ref_blk,
+ int ref_offset,
+ void *priv_data),
+ void *priv_data)
+{
+ int i;
+ int r, ret = 0;
+ struct ext2_inode inode;
+ errcode_t retval;
+ struct block_context ctx;
+ int limit;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
+ if (ctx.errcode)
+ return ctx.errcode;
+
+ /*
+ * Check to see if we need to limit large files
+ */
+ if (flags & BLOCK_FLAG_NO_LARGE) {
+ if (!LINUX_S_ISDIR(inode.i_mode) &&
+ (inode.i_size_high != 0))
+ return EXT2_ET_FILE_TOO_BIG;
+ }
+
+ limit = fs->blocksize >> 2;
+
+ ctx.fs = fs;
+ ctx.func = func;
+ ctx.priv_data = priv_data;
+ ctx.flags = flags;
+ ctx.bcount = 0;
+ if (block_buf) {
+ ctx.ind_buf = block_buf;
+ } else {
+ retval = ext2fs_get_array(3, fs->blocksize, &ctx.ind_buf);
+ if (retval)
+ return retval;
+ }
+ ctx.dind_buf = ctx.ind_buf + fs->blocksize;
+ ctx.tind_buf = ctx.dind_buf + fs->blocksize;
+
+ /*
+ * Iterate over the HURD translator block (if present)
+ */
+ if ((fs->super->s_creator_os == EXT2_OS_HURD) &&
+ !(flags & BLOCK_FLAG_DATA_ONLY)) {
+ if (inode.osd1.hurd1.h_i_translator) {
+ ret |= (*ctx.func)(fs,
+ &inode.osd1.hurd1.h_i_translator,
+ BLOCK_COUNT_TRANSLATOR,
+ 0, 0, priv_data);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ check_for_ro_violation_goto(&ctx, ret, abort_exit);
+ }
+ }
+
+ if (inode.i_flags & EXT4_EXTENTS_FL) {
+ ext2_extent_handle_t handle;
+ struct ext2fs_extent extent;
+ e2_blkcnt_t blockcnt = 0;
+ blk_t blk, new_blk;
+ int op = EXT2_EXTENT_ROOT;
+ int uninit;
+ unsigned int j;
+ unsigned int count=0;
+ unsigned int percentage=0;
+ unsigned int step=((struct mkjournal_struct *)priv_data)->num_blocks/100+1;
+
+ ctx.errcode = ext2fs_extent_open2(fs, ino, &inode, &handle);
+ if (ctx.errcode)
+ goto abort_exit;
+ while (1) {
+ ctx.errcode = ext2fs_extent_get(handle, op, &extent);
+
+ if (ctx.errcode) {
+ if (ctx.errcode != EXT2_ET_EXTENT_NO_NEXT)
+ break;
+ ctx.errcode = 0;
+ if (!(flags & BLOCK_FLAG_APPEND))
+ break;
+ next_block_set:
+ count++;
+ blk = 0;
+ r = (*ctx.func)(fs, &blk, blockcnt,
+ 0, 0, priv_data);
+ ret |= r;
+ check_for_ro_violation_goto(&ctx, ret,
+ extent_errout);
+ if (r & BLOCK_CHANGED) {
+ ctx.errcode =
+ ext2fs_extent_set_bmap(handle,
+ (blk64_t) blockcnt++,
+ (blk64_t) blk, 0);
+ if (ctx.errcode || (ret & BLOCK_ABORT)){
+ //printf("count 0x%x\n", count);
+ printf("\b\b\b");
+ printf("100%\n");
+ break;
+ }
+ if (blk) {
+ if ((count%step)==0) {
+ //printf("count 0x%x\n",count);
+ printf("\b\b\b");
+ percentage++;
+ printf("%2d\%", percentage);
+ }
+ goto next_block_set;
+ }
+ }
+ break;
+ }
+ op = EXT2_EXTENT_NEXT;
+ blk = extent.e_pblk;
+ if (!(extent.e_flags & EXT2_EXTENT_FLAGS_LEAF)) {
+ if (ctx.flags & BLOCK_FLAG_DATA_ONLY)
+ continue;
+ if ((!(extent.e_flags &
+ EXT2_EXTENT_FLAGS_SECOND_VISIT) &&
+ !(ctx.flags & BLOCK_FLAG_DEPTH_TRAVERSE)) ||
+ ((extent.e_flags &
+ EXT2_EXTENT_FLAGS_SECOND_VISIT) &&
+ (ctx.flags & BLOCK_FLAG_DEPTH_TRAVERSE))) {
+ ret |= (*ctx.func)(fs, &blk,
+ -1, 0, 0, priv_data);
+ if (ret & BLOCK_CHANGED) {
+ extent.e_pblk = blk;
+ ctx.errcode =
+ ext2fs_extent_replace(handle, 0, &extent);
+ if (ctx.errcode)
+ break;
+ }
+ }
+ continue;
+ }
+ uninit = 0;
+ if (extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
+ uninit = EXT2_EXTENT_SET_BMAP_UNINIT;
+ for (blockcnt = extent.e_lblk, j = 0;
+ j < extent.e_len;
+ blk++, blockcnt++, j++) {
+ new_blk = blk;
+ r = (*ctx.func)(fs, &new_blk, blockcnt,
+ 0, 0, priv_data);
+ ret |= r;
+ check_for_ro_violation_goto(&ctx, ret,
+ extent_errout);
+ if (r & BLOCK_CHANGED) {
+ ctx.errcode =
+ ext2fs_extent_set_bmap(handle,
+ (blk64_t) blockcnt,
+ (blk64_t) new_blk,
+ uninit);
+ if (ctx.errcode)
+ goto extent_errout;
+ }
+ if (ret & BLOCK_ABORT)
+ break;
+ }
+ }
+
+ extent_errout:
+ ext2fs_extent_free(handle);
+ ret |= BLOCK_ERROR | BLOCK_ABORT;
+ goto errout;
+ }
+
+ /*
+ * Iterate over normal data blocks
+ */
+ for (i = 0; i < EXT2_NDIR_BLOCKS ; i++, ctx.bcount++) {
+ if (inode.i_block[i] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= (*ctx.func)(fs, &inode.i_block[i],
+ ctx.bcount, 0, i, priv_data);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ }
+ }
+ check_for_ro_violation_goto(&ctx, ret, abort_exit);
+ if (inode.i_block[EXT2_IND_BLOCK] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= block_iterate_ind(&inode.i_block[EXT2_IND_BLOCK],
+ 0, EXT2_IND_BLOCK, &ctx);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ } else
+ ctx.bcount += limit;
+ if (inode.i_block[EXT2_DIND_BLOCK] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= block_iterate_dind(&inode.i_block[EXT2_DIND_BLOCK],
+ 0, EXT2_DIND_BLOCK, &ctx);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ } else
+ ctx.bcount += limit * limit;
+ if (inode.i_block[EXT2_TIND_BLOCK] || (flags & BLOCK_FLAG_APPEND)) {
+ ret |= block_iterate_tind(&inode.i_block[EXT2_TIND_BLOCK],
+ 0, EXT2_TIND_BLOCK, &ctx);
+ if (ret & BLOCK_ABORT)
+ goto abort_exit;
+ }
+
+abort_exit:
+ if (ret & BLOCK_CHANGED) {
+ retval = ext2fs_write_inode(fs, ino, &inode);
+ if (retval) {
+ ret |= BLOCK_ERROR;
+ ctx.errcode = retval;
+ }
+ }
+errout:
+ if (!block_buf)
+ ext2fs_free_mem(&ctx.ind_buf);
+
+ return (ret & BLOCK_ERROR) ? ctx.errcode : 0;
+}
+
+/*
+ * Emulate the old ext2fs_block_iterate function!
+ */
+
+struct xlate {
+ int (*func)(ext2_filsys fs,
+ blk_t *blocknr,
+ int bcount,
+ void *priv_data);
+ void *real_private;
+};
+
+#ifdef __TURBOC__
+ #pragma argsused
+#endif
+static int xlate_func(ext2_filsys fs, blk_t *blocknr, e2_blkcnt_t blockcnt,
+ blk_t ref_block EXT2FS_ATTR((unused)),
+ int ref_offset EXT2FS_ATTR((unused)),
+ void *priv_data)
+{
+ struct xlate *xl = (struct xlate *) priv_data;
+
+ return (*xl->func)(fs, blocknr, (int) blockcnt, xl->real_private);
+}
+
+errcode_t ext2fs_block_iterate(ext2_filsys fs,
+ ext2_ino_t ino,
+ int flags,
+ char *block_buf,
+ int (*func)(ext2_filsys fs,
+ blk_t *blocknr,
+ int blockcnt,
+ void *priv_data),
+ void *priv_data)
+{
+ struct xlate xl;
+
+ xl.real_private = priv_data;
+ xl.func = func;
+
+ return ext2fs_block_iterate2(fs, ino, BLOCK_FLAG_NO_LARGE | flags,
+ block_buf, xlate_func, &xl);
+}
+
generated by cgit (git 2.34.1) at 2024-12-22 15:43:51 +0000